Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts receivable, allowance for doubtful accounts	$ 5,157	$ 4,849
Accounts receivable, allowance for appeals	$ 5,348	$ 6,614
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	175,000,000	175,000,000
Common stock, shares issued (in shares)	95,406,154	95,263,461
Common stock, shares outstanding (in shares)	84,132,408	83,989,715
Treasury stock, shares (in shares)	11,273,746	11,273,746